N19-21_6646

def f(x,y,k):
    bef = k - 1
    if max(x,y) >= 50:
        if bef == 3:
            return 1
        else: #bef < 3
            return 0
    elif bef == 3: #max(x,y) < 50
        return 0
    A = f(x + 3, y, k + 1)
    B = f(2 * x, y, k + 1)
    C = f(x, y + 3, k + 1)
    D = f(x, 2 * y, k + 1)
    if k % 2 == 1: #П
        return A or B or C or D
    else: #В
        return A and B and C and D
a = []
for s in range(28):
    if f(22, s, 1):
        a.append(s)
print(a)